This adds a generic uio driver that can bind to any PCI device. Firstuser will be virtualization where a qemu userspace process needs to giveguest OS access to the device.

Interrupts are handled using the Interrupt Disable bit in the PCIcommand register and Interrupt Status bit in the PCI status register.All devices compliant to PCI 2.3 (circa 2002) and all compliant PCIExpress devices should support these bits. Driver detects this support,and won't bind to devices which do not support the Interrupt Disable Bitin the command register.

It's expected that more features of interest to virtualization will beadded to this driver in the future. Possibilities are: mmap for deviceresources, MSI/MSI-X, eventfd (to interface with kvm), iommu.